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Precambrian – Cambrian terrane contact, Reversing Rapids at slack tide, Saint John, New Brunswick

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Colour photograph of bridge steelwork, river and rock face
photograph: Precambrian – Cambrian terrane contact, Reversing Rapids at slack tide, Saint John, New Brunswick, 2009. Stonehammer Geopark. At the Reversing Rapids in Saint John the gorge exposes Precambrian grey rocks of the Brookville Terrane (right) below the bridge and black rocks of the Avalon Composite Terrane (left) downriver. The Caledonia Fault lies along the contact of the two terranes.